it is unfair for middle-class earners to pay the Social Security tax "on every dime they make," while millionaires and billionaires pay it on only "a very small percentage of their income."

It's plenty fair now because the benefits are capped along with the tax.

Think of it like car insurance. You pay $500/year to cover car X. A really rich person pays $500/year to cover car X. Is that unfair? Should he pay more for the same coverage just because he has more? So why should he pay more for the same SS benefits just because he has more? While we're at it, why not make rich people pay double the sales tax?

Same old Democratic claptrap--there's a whole lot of exploitation of class envy going on.